for(let i =0 ; i < 10;i++){
    console.log(i);   //输出0123456789
}
// console.log(i);   //报错  因为没有写在会计作用域里面
const a = {}
a.name = "ls"
const fn = function(){
    console.log(a);
    return 8
}
console.log(fn());
